Question

Can someone show me how to get the roots of r^3-10r+25=0?

Answer 1

the rational root theorem will narrow down the possibilities

Answer 2

The possible rational roots are the factors of the constant term divided by the factors of the coefficient of the leading term.

Answer 3

So we'd have 25, 5, and 1 for possible rational roots, right?

Answer 4

+/-

Answer 5

I don't think any of the rational roots work in this case, can someone show me how to get irrational roots?

Answer 6

um... that's not an easy thing to do
I would just refer to the wolf:
http://www.wolframalpha.com/input/?i=solve%20%20r%5E3-10r%2B25%3D0&t=crmtb01

Answer 7

Thank you